I start feeding puppy caned mixed with the solid gold about day 30 too. I don't start any calcium rich food until labor, but i do give her a couple of teaspons of plain yogurt a week. once she has whelped I start her in whelping pudding it worked wonderful with my first litter and my mentor does that too.. I also free feed so is kibble available to them all day long..
, best of luck..
hugs,
CArmen in nj